Apple Compressor (4.1.2) User Manual
Page 31
Chapter 4
Advanced adjustments
31
General properties
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Name: Displays the name of the setting.
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Description: Displays the description of the setting.
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Extension: Displays the extension of the output file (.264).
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Allow job segmenting: Job segmenting is not available for this setting.
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Default location: Select an item from the pop-up menu to set the default save location for
transcoded files.
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Stream Usage: Use the pop-up menu to set whether the output file is transcoded for Blu-ray
Disc or AVCHD.
Retiming
This section contains one property:
•
Set duration to: Sets the processing algorithm used to adjust the frame rate during transcoding.
Select one of the following options:
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[Percentage] of source: Modifies the output clip’s speed by a percentage of the source clip’s
speed. Enter a value in the percentage field or choose a preset value from the adjacent
pop-up menu (with a downward arrow).
•
[Total duration]: Sets the duration of the clip. Enter a timecode duration in the field or click
the arrows to increase or decrease the time.
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So source frames play at [frame rate] fps: Nondestructively changes the playback speed of the
clip, without discarding frames or creating new frames. This setting has no effect unless the
“Frame rate” value in the Video inspector is different than the source file’s frame rate. For
example, if you add a 10-second source file with a frame rate of 24 fps to Compressor, set the
“Frame rate” property in the Video inspector to 25 fps, and then select “So source frames play
at 25 fps” in the General inspector, the duration of the transcoded clip (at 25 fps) is 9 seconds
and 15 frames.
For more information, see
on page 69.
Video properties
•
Frame size: Use the pop-up menu to set the frame size (resolution) for the output file. For more
information, see
on page 67.
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Pixel aspect ratio: For settings that use the H.264 format, the pixel aspect ratio is set to Square.
•
Frame rate: Use this pop-up menu to set the playback rate (the number of images displayed
per second) for the output file. For more information, see
page 69.
•
Field order: For settings that use the H.264 format, the field order is set to Progressive
(complete frames are scanned).
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Automatically select bit-rate: Select this checkbox to have Compressor automatically compute
the best bit rate for the output file, based on the duration of the source file. If the checkbox
is not selected, you can set the average and maximum bit rates by dragging the “Average bit
rate” and “Maximum bit rate” sliders or entering values in the text fields.
•
Multi-pass: Select this checkbox to turn on multi-pass encoding that uses additional analysis
of video frames to produce a high-quality output file. For faster (single-pass) transcoding, turn
this feature off by deselecting the checkbox.
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